Electrocatalytic denitrification is an attractive and effective method for complete elimination of nitrate (NO₃^–). However, its application is limited by the activity and stability of the electrocatalyst. In this work, a novel bimetallic electrode was synthesized, in which N-doped graphitized carbon sealed with Cu and Fe nanoparticles and immobilized them on nickel foam (CuFe NPs@NC/NF) without any chemical binder. The immobilized Cu-Fe nanoparticles not only facilitated the adsorption of the reactant but also enhanced the electron transfer between the cathode and NO₃^–, thus promoting the electrochemical reduction of NO₃^–. Therefore, the as-prepared electrode exhibited enhanced electrocatalytic activity for NO₃^– reduction. The composite electrode with the Cu/Fe molar ratio of 1:2 achieved the highest NO₃^– removal (79.4 %) and the lowest energy consumption (0.0023 kW h mg⁻¹). Furthermore, the composite electrode had a robust NO₃^– removal capacity under various conditions. Benefitting from the electrochlorination on the anode, this electrochemical system achieved nitrogen (N₂) selectivity of 94.0 %. Moreover, CuFe NPs@NC/NF exhibited good stability after 15 cycles, which should be attributed to the graphitized carbon layer. This study confirmed that CuFe NPs@NC/NF electrode is a promising and inexpensive electrode with long-term stability for electrocatalytic denitrification.

_{电催化反硝化是一种完全消除硝酸盐 (NO 3} ^– )的有吸引力且有效的方法。然而，其应用受到电催化剂活性和稳定性的限制。在这项工作中，合成了一种新型双金属电极，其中 N 掺杂石墨化碳用 Cu 和 Fe 纳米粒子密封，并将它们固定在泡沫镍 (CuFe NPs@N C/NF) 上，无需任何化学粘合剂。固定化的Cu-Fe纳米粒子不仅促进了反应物的吸附，而且增强了阴极与NO ₃ ^-之间的电子转移，从而促进了NO ₃ ^{-的电化学还原。}. 因此，所制备的电极表现出增强的 NO ₃ ^–还原电催化活性。Cu/Fe 摩尔比为 1:2 的复合电极实现了最高的 NO ₃ ^–去除率 (79.4 %) 和最低的能耗 (0.0023 kW h mg ^-1 )。此外，该复合电极在各种条件下均具有强大的 NO ₃ ^{–去除能力。}受益于阳极上的电氯化，该电化学系统实现了 94.0% 的氮 (N ₂ ) 选择性。此外，CuFe NPs@N C/NF 在 15 个循环后表现出良好的稳定性，这应归因于石墨化碳层。本研究证实 CuFe NPs@NC/NF电极是一种有前途且廉价的电极，具有长期稳定性，可用于电催化反硝化。